Mercurial > libervia-backend
annotate libervia/backend/tools/trigger.py @ 4294:a0ed5c976bf8 default tip @
component conferences, plugin XEP-0167, XEP-0298: add stream user metadata:
A/V conference now adds user metadata about the stream it is forwarding through XEP-0298.
This is parsed and added to metadata during confirmation on client side.
rel 448
author | Goffi <goffi@goffi.org> |
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date | Tue, 06 Aug 2024 23:43:11 +0200 |
parents | 0d7bb4df2343 |
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3028 | 1 #!/usr/bin/env python3 |
3137 | 2 |
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3 |
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4 # SAT: a jabber client |
3479 | 5 # Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org) |
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6 |
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7 # This program is free software: you can redistribute it and/or modify |
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8 # it under the terms of the GNU Affero General Public License as published by |
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9 # the Free Software Foundation, either version 3 of the License, or |
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10 # (at your option) any later version. |
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11 |
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12 # This program is distributed in the hope that it will be useful, |
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13 # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 # GNU Affero General Public License for more details. |
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16 |
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17 # You should have received a copy of the GNU Affero General Public License |
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18 # along with this program. If not, see <http://www.gnu.org/licenses/>. |
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19 |
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20 """Misc usefull classes""" |
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21 |
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22 import inspect |
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23 from typing import Callable |
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24 from libervia.backend.core.i18n import _ |
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25 from libervia.backend.core.log import getLogger |
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26 from libervia.backend.core.core_types import SatXMPPEntity |
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27 |
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28 log = getLogger(__name__) |
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29 |
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30 |
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31 class TriggerException(Exception): |
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32 pass |
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33 |
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34 |
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35 class SkipOtherTriggers(Exception): |
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36 """Exception to raise if normal behaviour must be followed instead of following triggers list""" |
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37 |
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38 pass |
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39 |
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40 |
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41 class TriggerManager(object): |
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42 """This class manage triggers: code which interact to change the behaviour of SàT""" |
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43 |
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44 try: # FIXME: to be removed when a better solution is found |
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45 MIN_PRIORITY = float("-inf") |
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46 MAX_PRIORITY = float("+inf") |
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47 except: # XXX: Pyjamas will bug if you specify ValueError here |
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48 # Pyjamas uses the JS Float class |
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49 MIN_PRIORITY = Number.NEGATIVE_INFINITY |
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50 MAX_PRIORITY = Number.POSITIVE_INFINITY |
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51 |
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52 def __init__(self): |
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53 self.__triggers = {} |
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54 |
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55 def is_available(self, args: list): |
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56 """Check if plugin used in a client context, and if it's available""" |
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57 if not args or not isinstance(args[0], SatXMPPEntity): |
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58 # we are not in the context of a client |
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59 return True |
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60 client = args[0] |
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61 if not client.is_component: |
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62 # plugins are always avaialble for normal clients |
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63 return True |
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64 |
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65 def add(self, point_name, callback: Callable, priority=0): |
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66 """Add a trigger to a point |
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67 |
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68 @param point_name: name of the point when the trigger should be run |
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69 @param callback: method to call at the trigger point |
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70 @param priority: callback will be called in priority order, biggest |
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71 first |
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72 """ |
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73 if point_name not in self.__triggers: |
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74 self.__triggers[point_name] = [] |
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75 if priority != 0 and priority in [ |
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76 trigger_tuple[0] for trigger_tuple in self.__triggers[point_name] |
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77 ]: |
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78 if priority in (self.MIN_PRIORITY, self.MAX_PRIORITY): |
3028 | 79 log.warning(_("There is already a bound priority [%s]") % point_name) |
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80 else: |
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81 log.debug( |
3028 | 82 _("There is already a trigger with the same priority [%s]") |
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83 % point_name |
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84 ) |
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85 self.__triggers[point_name].append((priority, callback)) |
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86 self.__triggers[point_name].sort( |
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87 key=lambda trigger_tuple: trigger_tuple[0], reverse=True |
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88 ) |
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89 |
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90 def add_with_check( |
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91 self, point_name: str, plugin, callback: Callable, priority: int = 0 |
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92 ) -> None: |
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93 """Like [Add], but check session before running the trigger |
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94 |
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95 This method is to be used for triggers which can run in components and are |
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96 expecting a ``client``: as all plugins are not run for component, a check will be |
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97 added before running the trigger, if the plugin is not valid for this component, |
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98 the trigger is ignored. ``client`` must be the first positional argument. |
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99 |
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100 @param point_name: name of the trigger point |
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101 @param plugin: instance of the plugin using this trigger. This is necessary to |
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102 check if the plugin is available in the session. |
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103 @param callback: method to call at the trigger point |
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104 @param priority: callback will be called in priority order, biggest first |
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105 """ |
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106 if inspect.iscoroutinefunction(callback): |
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107 |
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108 async def async_wrapper(client: SatXMPPEntity, *args, **kwargs): |
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109 if client.is_component and plugin not in client.plugins: |
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110 log.debug(f"Ignoring {callback} as parent plugin is not available") |
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111 return True |
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112 else: |
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113 return await callback(client, *args, **kwargs) |
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114 |
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115 self.add(point_name, async_wrapper, priority) |
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116 else: |
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117 |
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118 def sync_wrapper(client: SatXMPPEntity, *args, **kwargs): |
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119 if client.is_component and plugin not in client.plugins: |
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120 log.debug(f"Ignoring {callback} as parent plugin is not available") |
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121 return True |
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122 else: |
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123 return callback(client, *args, **kwargs) |
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124 |
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125 self.add(point_name, sync_wrapper, priority) |
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126 |
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127 def remove(self, point_name, callback): |
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128 """Remove a trigger from a point |
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129 |
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130 @param point_name: name of the point when the trigger should be run |
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131 @param callback: method to remove, must exists in the trigger point |
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132 """ |
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133 for trigger_tuple in self.__triggers[point_name]: |
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134 if trigger_tuple[1] == callback: |
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135 self.__triggers[point_name].remove(trigger_tuple) |
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136 return |
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137 raise TriggerException("Trying to remove an unexisting trigger") |
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138 |
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139 def point(self, point_name, *args, **kwargs): |
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140 """This put a trigger point |
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141 |
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142 All the triggers for that point will be run |
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143 @param point_name: name of the trigger point |
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144 @param *args: args to transmit to trigger |
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145 @param *kwargs: kwargs to transmit to trigger |
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146 if "triggers_no_cancel" is present, it will be popup out |
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147 when set to True, this argument don't let triggers stop |
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148 the workflow |
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149 @return: True if the action must be continued, False else |
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150 """ |
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151 if point_name not in self.__triggers: |
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152 return True |
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153 |
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154 can_cancel = not kwargs.pop("triggers_no_cancel", False) |
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155 |
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156 for priority, trigger in self.__triggers[point_name]: |
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157 try: |
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158 if not trigger(*args, **kwargs) and can_cancel: |
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159 return False |
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160 except SkipOtherTriggers: |
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161 break |
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162 return True |
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163 |
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164 def return_point(self, point_name, *args, **kwargs): |
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165 """Like point but trigger must return (continue, return_value) |
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166 |
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167 All triggers for that point must return a tuple with 2 values: |
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168 - continue, same as for point, if False action must be finished |
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169 - return_value: value to return ONLY IF CONTINUE IS FALSE |
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170 @param point_name: name of the trigger point |
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171 @return: True if the action must be continued, False else |
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172 """ |
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173 |
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174 if point_name not in self.__triggers: |
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175 return True |
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176 |
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177 for priority, trigger in self.__triggers[point_name]: |
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178 try: |
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179 cont, ret_value = trigger(*args, **kwargs) |
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180 if not cont: |
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181 return False, ret_value |
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182 except SkipOtherTriggers: |
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183 break |
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184 return True, None |